Posted by Samuel on Wednesday, August 25, 2010 at 8:15pm.
An auditorium has 20 rows of seats.These are 20 seats in the first row,21 in the second row and 22 in the third row and so on.how many seats are there in all rows?

arithmetic  sylvia, Wednesday, August 25, 2010 at 8:44pm
19(30) + 20= 590
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